GB/T 45282-2025 in English
VALIDIPv6 address assignment and encoding rules—General requirements
- Issued on:2025-02-28
- Implemented on:2025-06-01
- File Format:PDF
- Delivery:Via email within 5 business days
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| Standard No: | GB/T 45282-2025 |
| Document status: | VALID |
| Title in English: | IPv6 address assignment and encoding rules—General requirements |
| Title in Chinese: | IPv6地址分配和编码规则 总体要求 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2025-02-28 |
| Implemented on: | 2025-06-01 |
| ICS Classification: | 33.040-Telecommunication systems |
| Chinese Classification: | L78-Data information |
| Professional Classification: | GB-National Standard |
| Related Topics: | ipv6 access address encoding
|
《GB/T 45282-2025IPv6地址分配和编码规则 总体要求》由TC485（全国通信标准化技术委员会）归口，主管部门为工业和信息化部（通信）。
Introduction
Background of IPv6 address standardization evolution
With the comprehensive evolution of Internet protocol from IPv4 to IPv6, my country issued the GB/T 45282-2025 standard in 2025, which systematically standardized the allocation and coding system of IPv6 addresses for the first time. The standard was jointly formulated by the Ministry of Industry and Information Technology, the three major operators, Huawei, ZTE and other companies, marking that my country's large-scale deployment of IPv6 has entered a new stage of standardization.
Core Terminology Definition Analysis
| Terminology | Definition | Application Scenarios |
|---|---|---|
| Global Unicast Address | 2000::/3 prefix, reachable from the public network | Internet access service |
| Unique Local Address | FC00::/7 prefix, used within a site | Enterprise Intranet Architecture |
| Requested Node Multicast | FF02::1:FF00:0/104 | Neighbor Discovery Protocol |
Address Representation Technical Specification
5.1 Hexadecimal representation of the ciphertext
The standard specifies three representation forms:
1) Preferred format: 2001:0db8:85a3:0000:0000:8a2e:0370:7334
2) Zero compression format: 2001:db8:85a3::8a2e:370:7334
3) Embedded IPv4 format: ::ffff:192.168.1.1
Detailed explanation of the seven allocation principles
- Semantic encoding: The address is required to contain geographic/business type information. For example, the Beijing education network can use the BJ-EDU prefix
- Route aggregation: The prefix length of routes across autonomous domains is ≤/32, and that between regions is ≤/48
- Security isolation: Services of different security levels must use independent address segments
Address type technology comparison
| Type | Prefix | Scope | Typical applications |
|---|---|---|---|
| Global unicast | 2000::/3 | Internet global | Public broadband access |
| Link local | FE80::/10 | Single link | Router discovery protocol |
| Multicast address | FF00::/8 | Specified range | Video conferencing system |
Implementation suggestions
Operator deployment guide
1. Hierarchical planning: Provincial nodes are allocated /32 prefixes, and prefecture-level cities are allocated /48 subnets
2. Business isolation: IDC, CDN and other businesses use independent address segments
3. Five-year reservation: The number of addresses applied for at a time must meet the growth demand for 5 years
Enterprise network transformation
1. Internal systems give priority to using FD00::/8 unique local addresses
2. Deploy NAT64 at the egress to achieve IPv4/IPv6 interoperability
3. Establish address management system to record allocation relationship
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